Bj70 Battery Cable

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How long have you owned your truck? Any recent mods / changes / work done on it?

Sounds like you could have some issues with high resistance on your grounds.

Have you checked the ground connections for cleanliness (wire wheeled to clean metal, dielectric grease), and inspected the cables? Are the cables original?

I've recently gone through some ground cable issues on my FJ-40, but the same principles apply to your truck.
 
Haven’t dug into it yet. It has sat for quit a long time. Last time driving it starting began to be an issue but I thought maybe a fuel problem was beginning to happen. It has 2 batteries and I had charged both. Thought maybe one battery wasn’t charged enough maybe causing the problem.
 
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I don't have any experience with a dual battery set-up.

But, having well-grounded connections are so critical.

So, check your grounds (connections and resistance in cables), and connections to your starter motor. Disclaimer: I know nothing about diesels, so the advice about a starter may be junk.
 
Was it cranking normal speed or slowly?
 
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